Here is a five fin rocket design using the ST-1380 BT with an 18mm motor mount. Suprisingly, a good preformer on four motors and good Dv's. I added some white fin areas to the 3D images just for coolness and they are not in the original file for stability reasons.

Enjoy and Thanks Again, JP

James Pierson
NAR#77907

Vapor Trail II (18mm)
Launch guide length: 36.0000 In

MOTOR.................MAX. ALTITUDE...........DEP. VELOCITY
A8-3...................189.35039 Ft.............4.9107 ft/s
B4-4...................458.94685 Ft.............6.5403 ft/s
B6-4...................467.08661 F.............11.5114 ft/s
C6-5...................1010.64305 Ft...........13.3931 ft/s
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Attached Thumbnails

     

Attached Files

Vapor Trail II.rkt (61.6 KB, 102 views)